Don't have a great fear of people knowing your IP addresses, it really doesn't matter.
For a start, you're giving it away every time you visit a website, or send an e-mail etc., it gets propagated all over the place; so hiding it from the board isn't going to make much difference. You'd only be stopping a handful of people seeing it compared to hundreds that you have no control over.
Secondly, why would you think that knowing someone's IP can stop them posting rubbish to a newsgroup anyway? Unless you're explicitly going to add them into a denyed hosts list on the web server (which unless you actually own it isn't going to happen), and that's a bit drastic! Unless the person is paying for a static IP it's probably dynamic anyway, plus, anyone that determined to make a nucience of themselves would no doubt just use a shell account somewhere else, make a free dial-up account for the hell of it, use a friends computer to post, or one in a public library etc..
Thirdly, I really don't think anyone is going to find out your street address from your IP address, that would take an
awful lot of cracking skill, and I honestly don't think that anyone would go about a burglary that way. The chances of someone noticing you leaving with a suitcase and driving off into the sunset are a lot higher I imagine!
With regards to people being 'hacked' because their IP address is visible, don't get too caught up in media frenzy. Most times, people end up installing trojans and that's how they get caught - so don't run .exe files from untrusted sources (or get a good virus scanner). Also, don't have file and print sharing on unless you need it, and absolutely don't have it on a gateway machine that you use to connect to the Internet with.
Alternatively, get a proper, free oporating system

(
www.mandrake.com)
Ian.